8.1 Speech Feature Extraction

Created Date: 2025-05-31

8.1.1 Digit Audio

8.1.2 Audio Format

Audio formats are file formats used to store digital audio data on computers and other devices. They can be broadly categorized into uncompressed, lossless, and lossy formats:

• Uncompressed formats like WAV and AIFF retain all original audio data, resulting in high-quality audio but large file sizes.

• Lossless formats like FLAC and ALAC compress audio data without losing any quality, offering a good balance between file size and quality.

• Lossy formats like MP3 and AAC achieve smaller file sizes by discarding some audio data, which can impact sound quality, especially at lower bitrates.

Waveform Audio File Format (WAVE, or WAV due to its filename extension) is an audio file format standard for storing an audio bitstream on personal computers.

8.1.3 FFmpeg Tools

FFmpeg is the leading multimedia framework, able to decode, encode, transcode, mux, demux, stream, filter and play pretty much anything that humans and machines have created. It supports the most obscure ancient formats up to the cutting edge.